CN103124437A - Packet aware scheduler in wireless communication systems - Google Patents
Packet aware scheduler in wireless communication systems Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/15—Flow control; Congestion control in relation to multipoint traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
- H04L47/56—Queue scheduling implementing delay-aware scheduling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/78—Architectures of resource allocation
- H04L47/788—Autonomous allocation of resources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/80—Actions related to the user profile or the type of traffic
- H04L47/803—Application aware
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/82—Miscellaneous aspects
- H04L47/824—Applicable to portable or mobile terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/04—Protocols specially adapted for terminals or networks with limited capabilities; specially adapted for terminal portability
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
- H04L67/62—Establishing a time schedule for servicing the requests
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
- H04W8/04—Registration at HLR or HSS [Home Subscriber Server]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
- H04W28/065—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
- H04W28/14—Flow control between communication endpoints using intermediate storage
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/24—Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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Abstract
Apparatuses and methodologies are described that facilitate packet aware scheduling are provided. In some embodiments, if all of the information of a packet cannot be scheduled in a single transmission period, additional resources may be assigned to transmission of the contents of the packet based upon latency requirements and/or transmission constraints of the packet.
Description
The application is that the application number submitted on 07 20th, 2005 is 200580031387.6, denomination of invention is divided an application for the application of " scheduler of packet aware in wireless communication system ".The cross reference of related application
According to 35U.S.C. § 119 (e), the application requires to enjoy that submit to, U.S. Provisional Patent Application No.60/589 that be entitled as " Packet Aware Scheduler " on July 20th, 2004,820 priority, rear a application is incorporated the application into way of reference in full.
Invention field
Put it briefly, the present invention relates to radio communication, specifically, the present invention relates in wireless network environment, the resource of distributing to subscriber equipment be dispatched.
Technical background
The popular means that Radio Network System has become most people in the world to communicate.In order to satisfy the demands of consumers and to improve portability and convenience, Wireless Telecom Equipment becomes more and more less and function is more and more stronger.Such as cell phone and the raising of disposal ability of the mobile device accessing terminal make the type of application available in wireless communication system and complexity thereof also constantly increase.These services have different bandwidth and time-delay demand.
It is the transfer resource of channel that wireless communication system comes the generation form usually in different ways.These systems can be code division multiplexing (CDM) system, frequency division multiplexing (FDM) system and Time Division Multiplexing system.The modification a kind of commonly used of FDM is OFDM (OFDM), and it is divided into a plurality of orthogonal subbands effectively with total system bandwidth.These subbands are also referred to as voiced band, carrier wave, subcarrier, frequency range and frequency channels.Each subband is corresponding to an adjustable subcarrier that is shaped with data.Employing is based on the technology of time-division, and a frequency band is divided into orderly timeslice or time slot by the time mode.A timeslice is provided for each user of channel, is used for sending and receiving information in a looping fashion.For example, at any given time t, the user can be in a short burst access channel.Then, access right switches to another user, and this user has also just had for the short time burst of receiving and sending messages.This " rotation " circulation continues, and is last, and each user has had a plurality of sending and receiving bursts.
Technology based on CDM is passed through available a plurality of frequency sending datas usually at any time in a certain scope.Generally, with Data Digital, and it is expanded on available bandwidth, wherein, a plurality of users can be overlapping on channel, and each user can get unique sequence code.A plurality of users can be in identical wide-band chunk of spectrum transmitted signal, wherein, each user's signal with its corresponding unique spreading code expansion on whole bandwidth.This technology can realize sharing, and wherein, one or more users can receive and dispatch simultaneously.This shared can the realization by spread spectrum digital modulation, wherein, user's bit stream is encoded with pseudo-random fashion, and expands on very wide channel.Receiver can be identified related unique sequences code, and cancels randomization, thereby collects specific user's bit with coherent manner.
Typical cordless communication network (for example, adopting frequency division, time-division and/or code minute technology) comprising: one or more base stations are used for providing the area of coverage; One or more movements (for example, wireless) terminal, can be in the area of coverage transceiving data.Typical base station can send a plurality of data flow of broadcasting, multicast and/or unicast services simultaneously, and wherein, data flow is a series of data, and its mobile terminal that can be correlated with receives independently.Mobile terminal in the area of coverage of this base station may wish to receive one of the combined-flow carrying, more than one or all data flow.Equally, mobile terminal can be to the base station or another mobile radio station send data.In these systems, bandwidth and other system resource are distributed by scheduler.
In addition, in typical communication network, information is assigned to the different grades of service according to its application that is used for or service.For example, some application as speech or video, usually require very low time-delay, and other application as simple request of data, may have higher tolerable time-delay.
The effect of scheduler in communication system be from a plurality of users' data-reusing on bandwidth, in order to carry out multiplexing.Scheduler can be multiplexed into user's transmission on time, frequency and/or space.The purpose of scheduler is that power system capacity (throughput) is maximized, and keeps the level of fairness of appointment and/or keep the corresponding throughput of each user between each user simultaneously.In addition, scheduler wishes to provide the optimal service of application of (service that for example, provides or application) operation is provided based on the user for the specific user.For example, scheduler wishes to make the corresponding time-delay target of connection of those operation time-delay sensitive application to be met.The above-mentioned target of scheduler is normally conflicting, and specific scheduler may lay particular emphasis on specific objective (for example, total sector capacity).
At least in view of the above, need to improve radio communication and system and/or the method for distributing to user's frequency resource in this area under wireless network environment.
Summary of the invention
The below summarizes one or more embodiment simply, in order to these embodiment are had a basic understanding.The summary of the invention part is not the commentary general to all embodiment that can contain, and, neither will determine key or the important component part of all embodiment, neither describe the scope of any or all embodiment.The unique purpose of content part of the present invention is to describe simply some concepts of one or more embodiment, with this preamble as the detailed description that presents later.
Final claims to be added are arranged.
Description of drawings
Fig. 1 shows the multi-address radio communication system according to an embodiment;
Fig. 2 shows the spectrum allocation schemes according to the multi-address radio communication system of an embodiment;
The simplified block diagram of Fig. 3 shows and is conducive to carry out according to an embodiment system that the resource of packet aware is distributed;
The functional block diagram of Fig. 4 shows the scheduler according to an embodiment;
Fig. 5 A shows the dispatching method according to an embodiment;
Fig. 5 B shows the dispatching method according to another embodiment;
Fig. 5 C shows the dispatching method according to another embodiment;
Fig. 6 shows according to the transmitter and receiver in the multi-address radio communication system of an embodiment.
Embodiment
Describe by reference to the accompanying drawings now each embodiment, in institute's drawings attached, identical mark is used for representing identical parts.In the following description, for ease of explaining, enumerate a lot of concrete details, in order to realize, one or more embodiment have been reached thorough understanding.But, it is evident that, these embodiment also can realize without these details.In other example, for ease of describing one or more embodiment, known structure and equipment are that the form with block diagram provides.
Referring to Fig. 1, it shows the multi-address radio communication system according to an embodiment.Multi-address radio communication system 100 comprises a plurality of residential quarters, for example, and residential quarter 102,104 and 106.In the embodiment in figure 1, respectively there is an access point 150 residential quarter 102,104 and 106, and access point 150 comprises a plurality of sectors.These a plurality of sectors are formed by many groups antenna, and every group of antenna is responsible for communicating with accessing terminal in the part of this residential quarter.In residential quarter 102, antenna sets 112,114 and 116 is separately corresponding to a different sector.In residential quarter 104, antenna sets 118,120 and 122 is separately corresponding to a different sector.In residential quarter 106, antenna sets 124,126 and 128 is separately corresponding to a different sector.
Each residential quarter comprises a plurality of accessing terminal, and the one or more sectors that access terminal with each access point communicate.For example, access terminal and 130 and 132 communicate by letter with base station 142, access terminal and 134 and 136 communicate by letter with access point 144, access terminal and 138 and 140 follow access point 146 to communicate by letter.
The access point that uses in this application can be the fixed station that communicates for terminal, and described access point can be known as base station, Node B or other term, and comprises some or all functions of base station, Node B or other term.Accessing terminal also to be known as subscriber equipment (UE), Wireless Telecom Equipment, terminal, mobile radio station or other term, and comprises some or all functions of subscriber equipment (UE), Wireless Telecom Equipment, terminal, mobile radio station or other term.
Referring to Fig. 2, it shows the spectrum allocation schemes of multi-address radio communication system.A plurality of OFDM symbols 200 are distributed on T symbol period and S frequency sub-carrier.Each OFDM symbol 200 comprises voiced band or the frequency sub-carrier in symbol period in this T symbol period and this S subcarrier.
In the OFDM frequency-hopping system, can distribute to given accessing terminal to one or more symbols 200, in an embodiment of allocative decision shown in Figure 2, one or more frequency hoppings district of a plurality of symbols (for example, frequency hopping district 202) communicates by reverse link and a group of access terminal.In each frequency hopping district, the distribution condition of symbol can be able to randomization, thereby reduces potential interference and frequency diversity is provided, in case harmful path effects.
The symbol 204 that each frequency hopping district 202 comprises distributes to that sector with access point communicates one or morely accesses terminal and distributes to the frequency hopping district.In each hop period or frame, the position in T symbol period and S subcarrier, frequency hopping district 202 becomes with frequency hop sequences, and in addition, each symbols that access terminal 204 of distributing in frequency hopping district 202 may change for each symbol period.
Frequency hop sequences can pseudorandom ground, randomly or according to predetermined sequence, select the position in the frequency hopping district 202 of each hop period.The frequency hop sequences of the different sectors of same access point is mutually orthogonal, to avoid with " " between the accessing terminal of same access point communication interference the residential quarter in.In addition, the mutual pseudorandom of the frequency hop sequences of the frequency hop sequences of each access point and near access point.This helps will be with " between the sector " interference randomization between a plurality of the accessing terminal of diverse access point communication.
For the situation of reverse link communication, some symbols 204 in frequency hopping district 202 are distributed to from accessing terminal to the frequency pilot sign of access point transmission.Distribute to the frequency pilot sign of symbol 204 and should preferably support space division multiple access (SDMA), wherein, if the space characteristics difference that accesses terminal corresponding to difference is enough large, the signal that difference of crossover accesses terminal in same frequency hopping district is due to a plurality of reception antennas at sector or access point place and can separate.
Should be pointed out that although the length in frequency hopping shown in Figure 2 district 200 is 7 symbol periods,, the length in frequency hopping district 200 can be any desired amount, its size can change between hop period, perhaps, changes between different frequency hoppings districts in given hop period.
With regard to size or opportunity, symbol, frequency hopping district etc. usually can be with respect to one by one mapping of grouping.The grouping that this just need to cut apart, and the symbol restructuring of cutting apart in rear bit, and this has increased the difficulty that the information bit that comprises in dividing into groups is dispatched in suitable mode.
Should be pointed out that although the embodiment of Fig. 2 launches to describe round utilizing piece to jump,, the position of piece needn't change between hop period continuously.
Should be pointed out that although the embodiment of Fig. 2 relates to the OFDMA system that utilizes the piece frequency hopping,, the present invention also can be operated in multiple different communication system.In one embodiment, communication system used can be time division multiplex system, and wherein, each user gets one or more time slots or its part in one or more frames, cycle etc.In these embodiments, each time slot can comprise a plurality of transmission symbols.Other embodiment can utilize CDMA or FDMA scheme, and wherein, each user gets transfer resource according to other standard, as long as these resources are alienable or limited.
Referring to Fig. 3, it has provided the simplified block diagram of the resource allocation system that is conducive to packet aware according to an embodiment.Network 300 sends grouping to wireless communication system 302, and receives grouping from wireless communication system 302.Adopt the first form from the grouping that network 300 receives, this form communication protocol used according to network contains the bit of specified quantity.The part that scheduler 304 distributes a plurality of groupings and a plurality of groupings is to channel resource, and this depends on size and the information content of grouping.For example, these channel resources can be OFDM symbol 200 or other transmission symbol.In any communication system, at any given time in the section limited amount of available channel resource (for example, OFDM symbol, time slot, CDMA code etc.) in system parameters.Therefore, whether scheduler 304 partly can be in transmission in a plurality of symbols, time slot, frequency hopping district etc. according to the full detail content of a grouping, for cycle preset time that the application under this grouping provides, determine which channel resource the information bit that comprises in each grouping is distributed to.
Except service quality (QoS), equitable proportion standard, other dispatching method or its combination, scheduler 304 can also adopt complete packet scheduling demand.That is to say, a factor that adopts when the dispatch list of the symbol of determining to send from wireless communication system 302 is: whether can send the information bit that comprises in dividing into groups in application requirements and the time frame by definition such as the symbol of wireless communication system, time slot, frequency hopping districts, this grouping has specific time-delay constraints according to its application.For example, if some groupings are to mail to the grouping of the Video Applications of user A, scheduler 304 is determined the amount of bits in this grouping, the quantity of the transmission symbol that the content of this Video Applications grouping of definite transmission is required.Then, scheduler 304 can according to user's QoS, fairness standard, other dispatching method or its combination, be dispatched the transmission of mailing to user A.But, in some cases, the full detail bit that comprises in the Video Applications grouping can't send in the required time section, so scheduler 304 will make a policy according to the delay requirement of Video Applications, judgement is the transmission of the corresponding symbol of information bit that arrangement comprises in dividing into groups with Video Applications in another part of this hop period, frame or transmission period, still attempt in current hop period, frame, transmission period, extra resource to be distributed to the information bit that comprises in the Video Applications grouping, etc.Extra transfer resource can be the transfer resource of distributing to other user, perhaps, can be the extra resource such as sharing data channel etc.
After scheduling, then the information bit in grouping offers transceiver 308 by modulator 306 modulation, accesses terminal in order to send to via one or more antennas.
Referring to Fig. 4, it shows the functional block diagram according to the scheduler of an embodiment.The information that receives from network is commonly called and is in application layer 400 or other high level.This information is generally comprised within grouping 402.The size of these groupings 402 is generally several bits, and can comprise timestamp, is when to be created by the different application that generates grouping to show data.According to the information type of sign during for example each divides into groups, can know the delay requirement of application.In order to send the information bit that comprises in grouping 402 by wave point, physical layer 406 needs generation to have the transmission symbol 408 of suitable size and form, in order to transmit by channel 410.
Mainly contain transmission symbol or other channel resource that two kinds of interface options can be used for the information bit that comprises in the grouping of application layer 400 is converted to physical layer 406.The first is bit interface, and its form with bit block is transferred to physical layer to information from application layer.Physical layer can be according to its oneself transmission symbol size, and the bit of request arbitrary size piece also sends it.The second interface is packet interface, and its form with grouping block is transferred to physical layer to information from application layer.Can adopt the piece of formed objects or the piece of different sizes, these groupings are offered scheduler 428.
The advantage of bit interface is: 406 pairs of accessible size of data of physical layer are restriction not.So just simplified the scheduler operation, because it can make scheduling, as long as block size adapts to available channel resources.But shortcoming is: owing to not considering the application layer feature, so application performance can be cut apart and descends due to the poor efficiency of application packet.In addition, scheduler is not known the application packet time-delay, therefore can't process the application delay requirement.On the other hand, the advantage of packet interface is: scheduler can be accessed the application packet details such as boundaries of packets.Shortcoming is: scheduler may not have channel resource to can be used to efficiently a plurality of users are multiplexed on channel.
Scheduler 428 adopts hybrid interface 430, and the latter comprises the function of bit interface and packet interface.Hybrid interface 430 has the physical layer ability, can obtain from application the data block of arbitrary size, thereby realizes the efficient scheduling of resource limited in channel and multiplexing.But different from bit interface is that this hybrid interface 430 provides can be used for relevant with application packet to dispatch the information of purpose to scheduler 428.For example, when physical layer request bit, the information that provides comprises the quantity of remaining bits in current group and the timestamp of this grouping.In addition, hybrid interface 430 also can be provided in packet size and the timestamp information of waiting for other grouping that is delivered to physical layer in application queue.
In one embodiment, scheduler 428 can utilize via the obtainable information of hybrid interface 430, thereby reduces the possibility of cutting apart application packet.If scheduler 428 is known boundaries of packets, so, even may be very difficult for available channel resources, scheduler 428 also can attempt to be arranged in current hop period to the remainder of this grouping or At All Other Times in frame.Scheduler 428 can be according to the quantity of remaining bits, the susceptibility and obtain the difficulty of channel resource of delaying time, and judges whether to cut apart application packet or whether whole session arrangement in current hop period or At All Other Times in section.
Use an advantage of this hybrid interface 430 to be: scheduler 428 can use physical channel constraints and application constraint condition, optimizes the utilance of channel, optimizes simultaneously the performance of using.
Referring to Fig. 5 A, 5B and 5C, it shows the dispatching method according to a plurality of embodiment.For example, these methods can relate to the packet aware scheduling in OFDM environment, OFDMA environment, CDMA environment, TDMA environment or other any suitable wireless environment.For ease of explanation, here with method representation be described as a series of action, but, be understood that and be understood that, these methods are not subjected to the restriction of running order because some action can according to one or more embodiment press that different order occur and/or with the application in expression and other action of describing occur simultaneously.For example, in state diagram, method also can be expressed as a series of correlation behavior or event.In addition, according to one or more embodiment, be not that the everything that illustrates is all required for realizing a method.
In Fig. 5 A, in module 502, receive information bit from a plurality of groupings in physical layer via hybrid interface.Then, in module 504, judge that whether information bit to be scheduled all will be arranged in those groupings in current slot from all the elements.If information bit to be scheduled from the content of each grouping can be arranged in current slot, so, in module 506, arrange these groupings according to the dispatching algorithm of system.Dispatching algorithm can be based on service quality (QoS), equitable proportion standard, other dispatching method or its combination.
If information bit to be scheduled from the content of each grouping do not arrange properly or can't be arranged in current slot, so, in module 508, judge time-delay constraints and/or other transmission requirement of the content of these groupings.
If the constraints of not delaying time and/or other transmission requirement obstruct the remaining information bit to transmit within the time period after a while, so, in module 510, the bit information these groupings in current slot is rejected away from dispatch list.If being arranged, time-delay constraints and/or other transmission requirement need to transmit grouping in current slot, so, in module 512, scheduler attempts to increase extra channel resource, in order to transmitted in packets is arrived the user, perhaps, withdraw channel resource from other user, so that all information bits have the grouping of time-delay constraints and/or other transmission requirement from those.Then, in module 514, this system dispatches according to the dispatching algorithm of system.
In Fig. 5 B, in module 550, select a grouping to cut apart, in order to offer scheduler.Then, in module 552, judge all information bits that whether have enough channel resources to can be used to arrange this grouping in current slot.If the content of this grouping can be arranged in current slot, so, in module 554, cut apart this grouping, and according to the dispatching algorithm of system, it is dispatched.Dispatching algorithm can be based on service quality (QoS), equitable proportion standard, other dispatching method or its combination.If the content of this grouping can't be arranged in current slot, so, in module 556, determine time-delay constraints and/or other transmission requirement of this packet content.
If the constraints of not delaying time and/or other transmission requirement obstruct the remaining information bit of this grouping to transmit, so, in module 558, cut apart this grouping, and the information bit that will have a channel resource is arranged in current slot within the time period after a while.The remaining information bit of the grouping of cutting apart is retained in one or more formations, in order to be arranged in after a while time period.
If being arranged, time-delay constraints and/or other transmission requirement need to transmit grouping in current slot, so, in module 560, scheduler attempts to increase extra channel resource, in order to transmitted in packets is arrived the user, perhaps, withdraw channel resource from other user, so that all information bits have the grouping of time-delay constraints and/or other transmission requirement from those.Then, in module 562, this system dispatches according to the dispatching algorithm of system.
In Fig. 5 C, in module 570, judge to be the quantity of the information bit of user scheduling.This judgement can be based upon the quantity of the grouping of this user storage, quantity or other method of the grouping that will send within the upcoming time period.Then, in module 572, according to the quantity of information bit in grouping, give each user assignment channel resource.Under many circumstances, the user can get fixed amount or the resource quantity of primary quantity (this depends on system load) at the most at the most, thus make a plurality of users can be in a transmission period access channel resource.Therefore, although the information bit allocation of channel resources may according to the grouping of cutting apart is attempted by system,, in first moment, such distribution can't be completed fully at least.The distribution of channel resource can be carried out according to the dispatching algorithm of system.Dispatching algorithm can be based on service quality (QoS), equitable proportion standard, other dispatching method or its combination.
After allocation of channel resources may, in module 574, judge whether all information bits of this user's the grouping of cutting apart have been assigned to channel resource in current slot.In module 576, if all information bits of the grouping of cutting apart have been assigned to channel resource in current slot, be considered as having completed scheduling.If all information bits of the grouping of cutting apart not yet are assigned to channel resource in current slot, so, in module 578, judgement is not time-delay constraints and/or other transmission requirement of the content of all information bits those groupings of all assigning to resource.
If the constraints of not delaying time and/or other transmission requirement obstruct the remaining information bit of this grouping to transmit within the time period after a while, so, in module 580, cut apart this grouping, and the information bit that will have a channel resource is arranged in transmission in current slot.The remaining information bit of the grouping of cutting apart is retained in one or more formations, in order to dispatched within the time period after a while.
If have time-delay constraints and/or other transmission demand to require transmission grouping in current slot, so, in module 582, scheduler attempts to increase extra channel resource, in order to transmitted in packets is arrived the user, perhaps, withdraw channel resource from other user, so that all information bits have the grouping of time-delay constraints and/or other transmission requirement from those.Then, in module 584, this system dispatches according to the dispatching algorithm of system.
Referring to Fig. 6, it shows transmitter and receiver in multi-address radio communication system according to an embodiment.In transmitter system 610, the business datum of a plurality of data flow offers emission (TX) data processor 614 from data source 612.In one embodiment, each data flow sends by corresponding transmitting antenna.TX data processor 614 formats the business datum of each data flow, encode and interweaves according to the encoding scheme of selecting for this data flow, thus the coded data of providing.In some embodiments, TX data processor 614, applies wave beam to the symbol of data flow and forms weight to which user transmission according to symbol.In some embodiments, wave beam forms weight and can generate according to the intrinsic beam vectors that receiver 602 generates, and offers transmitter 600 as feedback.In addition, arrange appropriate situation for transmission, TX data processor 614 can according to the sequencing information that sends from the user, be selected packet format.
The coded data of each data flow can use the OFDM technology to be multiplexed into together with pilot data.The known data patterns that pilot data is normally processed is in a known manner estimated channel response therefore can be used in receiver system.Then, according to the certain modulation schemes (for example, BPSK, QSPK, M-PSK or M-QAM) of selecting for each data flow, multiplexed pilot and the coded data of this data flow are modulated (that is, sign map), thereby modulation symbol is provided.The instruction that will carry out that processor 430 provides is depended in the data rate of each data flow, coding and modulation.
Then, the modulation symbol of all data flow is offered TX MIMO processor 620, TX MIMO processor 620 can further be processed modulation symbol (for example, carrying out OFDM).TX MIMO processor 620 is subsequently N
TIndividual stream of modulation symbols offers N
TIndividual transmitter (TMTR) 622a to 622t.In certain embodiments, TX MIMO processor 620 is mailing to which user according to symbol and symbol from which antenna sends, and the channel response information of User applies wave beam to the symbol of data flow and forms weight.
Each transmitter 622 receives and processes corresponding symbol stream, thereby one or more analog signal is provided, and further finishing (for example, amplification, filtering and up-conversion) analog information, is suitable for thereby provide the modulation signal that transmits by mimo channel.Then, from the N of transmitter 622a-622t
TIndividual modulation signal is respectively from N
TIndividual antenna 624a-624t sends.
In receiver system 650, the modulation signal of transmission is by N
RIndividual antenna 652a-652r receives, and will offer from the reception signal of each antenna 452 corresponding receiver (RCVR) 654.654 finishings (for example, filtering, amplification and down-conversion) of each receiver receive signal accordingly, signal digitalized with after finishing, thus a plurality of samplings are provided, further process these samplings, thereby provide corresponding " receptions " symbol to flow.
Then, RX data processor 660 receives from N
RThe N of individual receiver 654
RIndividual receiving symbol stream, and according to specific receiver treatment technology, it is processed, thereby a NT " detection " symbol stream is provided.The below also will describe the processing of RX data processor 660 in detail.The symbol that each detection symbol stream comprises is the estimation for the modulation symbol of respective stream of data transmission.Then RX data processor 660 carries out demodulation, deinterleaving and decoding to each detection symbol stream, thereby recovers the corresponding business datum of this data flow.The processing that the processing of RX data processor 660 is carried out with TX MIMO processor 620 and the TX data processor 614 at transmitter system 610 places is complementary.
The channel response that RX data processor 660 produces is estimated can be used in execution space, receiver place, space/time processing, regulating power level, change modulation rate or scheme or other action.RX processor 660 can also be estimated the signal of detection symbol stream to noise plus interference ratio (SNR) and other possible channel characteristics, and this tittle is offered processor 670.RX data processor 660 or processor 670 can further draw the estimated value of " work " SNR of system.Then, processor 670 provides the channel condition information (CSI) of estimation, and the latter can comprise the relevant various types of information of data flow of following communication link and/or receiving.For example, CSI can only comprise operating SNR.Then, CSI is also processed by the TX data processor 638 of the business datum that receives a plurality of data flow from data source 676, by modulator 680 modulation, by transmitter 654a-454r finishing, and sends it back transmitter system 610.
In transmitter system 610, received by antenna 624 from the modulation signal of receiver system 650, by receiver 622 finishings, by demodulator 640 demodulation, processed by RX data processor 642, thereby recover the CSI of receiver system report.Then, the CSI that reports is offered processor 630, to be used for: data rate and coding and modulation scheme that (1) specified data stream is used; (2) be that TX data processor 614 and TX MIMO processor 620 produce various control commands.
In data source 642 and 676, canned data is dispatched by scheduler dispatching method described according to Fig. 1-5.
Although Fig. 6 and relevant discussion thereof for be mimo system,, other many single outputs of input (MISO) and single output and multi-input (SIMO) system also can adopt structure, the method and system of discussing in the structure of Fig. 6 and the application.
The technology that the application describes can realize by variety of way.For example, these technology can realize with the mode of hardware, software or software and hardware combining.Realize for hardware, the processing unit that is used for channel estimating can be realized in one or more application-specific integrated circuit (ASIC)s (ASIC), digital signal processor (DSP), digital signal processor (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor, other electronic unit that is used for the described function of execution the application or its combination.Realize for software, the technology of describing in the application can realize with the module (for example, process, function etc.) of carrying out the described function of the application.
Top description comprises the example of one or more embodiment.Certainly, the institute of describing parts or method in order to describe these embodiment might be in conjunction with being impossible, and still, those of ordinary skill in the art should be realized that, these embodiment can do further combination and conversion.Therefore, the embodiment that describes in the application is intended to contain spirit and interior all accommodations, modification and the distortion of protection range that falls into appended claims.In addition, with regard to " comprising " word that uses in specification or claims, the mode that contains of this word is similar to " comprising " word, just as " comprising " word in the claims as link word explain.
Claims (13)
1. device that is conducive to dispatch in wireless communications environment comprises:
Scheduler, the message scheduling that obtains from application packet to channel resource; And
Hybrid interface provides from the block of information of the arbitrary size of described grouping and described application packet for information about.
2. device as claimed in claim 1, wherein, described information comprises the volume residual of bit in described application packet.
3. device as claimed in claim 1, wherein, described information comprises the timestamp of described application packet.
4. device as claimed in claim 1, wherein, described scheduler judges whether all information of each grouping in described a plurality of application packet have been arranged in described single transmission cycle; And
If all information that in described a plurality of application packet are not each grouping have been arranged in described single transmission cycle, determine not to be time-delay constraints and/or the transmission constraints that all information have all obtained those groupings of arranging.
5. device as claimed in claim 1, wherein, if have time-delay constraints and/or the transmission constraints of arbitrary application packet, the outer resource of described scheduler allocation is in order to all be arranged in the transmission of all information bits in the described single transmission cycle corresponding with this application packet.
6. device as claimed in claim 1, wherein, the constraints of if there is no delaying time and/or transmission constraints, described scheduler is arranged in the transmission of all information bits of described application packet in a plurality of transmission cycles.
7. electronic equipment comprises:
Memory, for the user stores a plurality of groupings, described a plurality of groupings comprise the information that will transmit by Radio Link, each grouping in described a plurality of groupings includes a plurality of bits; And
With the processor that described memory is connected, described processor is according to the quantity of described a plurality of information bits, with described a plurality of packet fragmentation, and determines to distribute to described user's transfer resource, transmits by Radio Link being used for.
8. electronic equipment as claimed in claim 7 also comprises:
Hybrid interface is determined the just quantity of the information bit in divided each grouping.
9. electronic equipment as claimed in claim 7 also comprises:
Scheduler according to being not the time-delay constraints that all information bits all have been arranged at the application of any grouping in single transmission cycle, determines whether to attempt extra transfer resource is arranged to described user.
10. electronic equipment as claimed in claim 7, wherein, described processor also allows the information bit of a grouping of transmission in a plurality of transmission cycles, unless the time-delay constraints of the application of described grouping obstructs such transmission.
11. the method that the transmission on Radio Link is arranged comprises:
Determine the quantity of the information bit of a plurality of groupings that will be by described transmission of radio links for the user; And
Partly according to the quantity of described information bit, for described user arranges transfer resource.
12. method as claimed in claim 11 also comprises:
If have time-delay constraints and/or transmission constraints, the outer resource of allocation is in order to be arranged in described user's transmission in described single transmission cycle.
13. method as claimed in claim 11 also comprises:
If there is no the time-delay constraints of described grouping and/or transmission constraints, be arranged in the transmission of the information of described grouping in described a plurality of transmission cycle.
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| RU2348119C2 (en) | 2009-02-27 |
| JP2008507918A (en) | 2008-03-13 |
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| JP5666326B2 (en) | 2015-02-12 |
| CN101310481B (en) | 2013-03-27 |
| US7961609B2 (en) | 2011-06-14 |
| CA2574711A1 (en) | 2006-02-02 |
| IL180825A0 (en) | 2007-06-03 |
| BRPI0513704A (en) | 2008-05-13 |
| WO2006012405A2 (en) | 2006-02-02 |
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